A stringybark can be any of the many Eucalyptus species which have thick, fiberous bark. Like all eucalypts, stringybarks belong to the Myrtaceae family. In exceptionally fertile locations some stringybark species — in particular Messmate Stringybark (Eucalyptus obliqua) — can be very large, reaching over 80 metres in height. More typically, stringybarks are medium-sized trees in the 10 to 40 metre range.

There are many different species of stringybark, including:

• Blue-leaved Stringybark (Eucalyptus agglomerata)
• Brown Stringybark
• Mealy Stringybark
• Messmate Stringybark (Eucalyptus obliqua)
• Red Stringybark
• Yellow Stringybark
• Thin-leaved Stringybark (Eucalyptus eugenioides).
• White Stringybark (Eucalyptus globoidea)

Studies have shown that Blue-leaved Stringybark is one of the 20-odd eucalypts preferred by Koalas.